When Archer and Castor Troy switch faces they go through the trouble of using lasers and stuff to change Archer's hair line by decreasing it and cutting some off. But one thing is, how did Castor Troy grow all that hair to get the same amount that Archer had? I'm pretty sure that no hair growing formula works that fast.

Give me a break. The whole movie is about something that can't actually happen in case you didn't know. People can't change faces over like they do in the movie. So being stupidly picky which you are then if they can remove a face and swap them then I guess they can make your hair grow and remove fat and whatever else they did to Caster and Sean. Think about it before you put in a stupid slip-up like this one. Besides if you watched the movie properly you would of known that they used hair plugs in his hair!!!!